[PATCH 0/2] fix bad constant expressions in tpm.h

[PATCH 0/2] fix bad constant expressions in tpm.h

[Jarkko Sakkinen]

Even though the cpu_to_be32() is open coded it is not a good convention
to call it in the enum definitions. This will also sparse errors about
invalid constant expressions.

Ed Swierk (1):
  tpm: Clean up reading of timeout and duration capabilities

Jarkko Sakkinen (1):
  tpm: fix bad constant expressions

 drivers/char/tpm/tpm-interface.c | 78 +++++++++++++---------------------------
 drivers/char/tpm/tpm-sysfs.c     |  4 +--
 drivers/char/tpm/tpm.h           | 23 ++++++------
 3 files changed, 38 insertions(+), 67 deletions(-)

-- 
2.7.4

[PATCH 1/2] tpm: Clean up reading of timeout and duration capabilities

[Jarkko Sakkinen]

From: Ed Swierk <eswierk-FilZDy9cOaHkQYj/0HfcvtBPR1lH4CV8@public.gmane.org>

Call tpm_getcap() from tpm_get_timeouts() to eliminate redundant
code. Return all errors to the caller rather than swallowing them
(e.g. when tpm_transmit_cmd() returns nonzero).

Signed-off-by: Ed Swierk <eswierk-FilZDy9cOaHkQYj/0HfcvtBPR1lH4CV8@public.gmane.org>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
---
 drivers/char/tpm/tpm-interface.c | 65 +++++++++++-----------------------------
 1 file changed, 17 insertions(+), 48 deletions(-)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 8de6187..ca6162e 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -488,10 +488,9 @@ static int tpm_startup(struct tpm_chip *chip, __be16 startup_type)
 
 int tpm_get_timeouts(struct tpm_chip *chip)
 {
-	struct tpm_cmd_t tpm_cmd;
+	cap_t cap;
 	unsigned long new_timeout[4];
 	unsigned long old_timeout[4];
-	struct duration_t *duration_cap;
 	ssize_t rc;
 
 	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
@@ -509,43 +508,25 @@ int tpm_get_timeouts(struct tpm_chip *chip)
 		return 0;
 	}
 
-	tpm_cmd.header.in = tpm_getcap_header;
-	tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
-	tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
-	tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
-	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, 0,
-			      NULL);
-
+	rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
+			"attempting to determine the timeouts");
 	if (rc == TPM_ERR_INVALID_POSTINIT) {
 		/* The TPM is not started, we are the first to talk to it.
 		   Execute a startup command. */
-		dev_info(&chip->dev, "Issuing TPM_STARTUP");
+		dev_info(&chip->dev, "Issuing TPM_STARTUP\n");
 		if (tpm_startup(chip, TPM_ST_CLEAR))
 			return rc;
 
-		tpm_cmd.header.in = tpm_getcap_header;
-		tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
-		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
-		tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
-		rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
-				      0, NULL);
+		rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
+				"attempting to determine the timeouts");
 	}
-	if (rc) {
-		dev_err(&chip->dev,
-			"A TPM error (%zd) occurred attempting to determine the timeouts\n",
-			rc);
-		goto duration;
-	}
-
-	if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
-	    be32_to_cpu(tpm_cmd.header.out.length)
-	    != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
-		return -EINVAL;
+	if (rc)
+		return rc;
 
-	old_timeout[0] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.a);
-	old_timeout[1] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.b);
-	old_timeout[2] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.c);
-	old_timeout[3] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.d);
+	old_timeout[0] = be32_to_cpu(cap.timeout.a);
+	old_timeout[1] = be32_to_cpu(cap.timeout.b);
+	old_timeout[2] = be32_to_cpu(cap.timeout.c);
+	old_timeout[3] = be32_to_cpu(cap.timeout.d);
 	memcpy(new_timeout, old_timeout, sizeof(new_timeout));
 
 	/*
@@ -583,29 +564,17 @@ int tpm_get_timeouts(struct tpm_chip *chip)
 	chip->timeout_c = usecs_to_jiffies(new_timeout[2]);
 	chip->timeout_d = usecs_to_jiffies(new_timeout[3]);
 
-duration:
-	tpm_cmd.header.in = tpm_getcap_header;
-	tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
-	tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
-	tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
-
-	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, 0,
-			      "attempting to determine the durations");
+	rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_DURATION, &cap,
+			"attempting to determine the durations");
 	if (rc)
 		return rc;
 
-	if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
-	    be32_to_cpu(tpm_cmd.header.out.length)
-	    != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
-		return -EINVAL;
-
-	duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
 	chip->duration[TPM_SHORT] =
-	    usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
+		usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_short));
 	chip->duration[TPM_MEDIUM] =
-	    usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
+		usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_medium));
 	chip->duration[TPM_LONG] =
-	    usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
+		usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_long));
 
 	/* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
 	 * value wrong and apparently reports msecs rather than usecs. So we
-- 
2.7.4


------------------------------------------------------------------------------

Re: [PATCH 1/2] tpm: Clean up reading of timeout and duration capabilities

[Jason Gunthorpe]

On Mon, Sep 19, 2016 at 11:22:08PM +0300, Jarkko Sakkinen wrote:
> From: Ed Swierk <eswierk@skyportsystems.com>
> 
> Call tpm_getcap() from tpm_get_timeouts() to eliminate redundant
> code. Return all errors to the caller rather than swallowing them
> (e.g. when tpm_transmit_cmd() returns nonzero).

I didn't look at these closely, but I agree with the idea.

Jason

Re: [PATCH 1/2] tpm: Clean up reading of timeout and duration capabilities

[Jarkko Sakkinen]

On Mon, Sep 19, 2016 at 05:24:06PM -0600, Jason Gunthorpe wrote:
> On Mon, Sep 19, 2016 at 11:22:08PM +0300, Jarkko Sakkinen wrote:
> > From: Ed Swierk <eswierk@skyportsystems.com>
> > 
> > Call tpm_getcap() from tpm_get_timeouts() to eliminate redundant
> > code. Return all errors to the caller rather than swallowing them
> > (e.g. when tpm_transmit_cmd() returns nonzero).
> 
> I didn't look at these closely, but I agree with the idea.

Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

/Jarkko

Re: [PATCH 1/2] tpm: Clean up reading of timeout and duration capabilities

[Jarkko Sakkinen]

On Fri, Oct 21, 2016 at 11:33:44PM +0300, Jarkko Sakkinen wrote:
> On Mon, Sep 19, 2016 at 05:24:06PM -0600, Jason Gunthorpe wrote:
> > On Mon, Sep 19, 2016 at 11:22:08PM +0300, Jarkko Sakkinen wrote:
> > > From: Ed Swierk <eswierk@skyportsystems.com>
> > > 
> > > Call tpm_getcap() from tpm_get_timeouts() to eliminate redundant
> > > code. Return all errors to the caller rather than swallowing them
> > > (e.g. when tpm_transmit_cmd() returns nonzero).
> > 
> > I didn't look at these closely, but I agree with the idea.
> 
> Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

I applied this. 

/Jarkko

[PATCH 2/2] tpm: fix bad constant expressions

[Jarkko Sakkinen]

Sparse reports "bad constant expression" for the use of cpu_to_be32
inside enums tpm_capabilities and tpm_sub_capabilities. Even though it
is probably expanded to a constant expression, it is probably cleaner not
to use it there.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
---
 drivers/char/tpm/tpm-interface.c | 13 ++++++++-----
 drivers/char/tpm/tpm-sysfs.c     |  4 ++--
 drivers/char/tpm/tpm.h           | 23 +++++++++++------------
 3 files changed, 21 insertions(+), 19 deletions(-)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index ca6162e..db7359f 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -444,19 +444,22 @@ ssize_t tpm_getcap(struct tpm_chip *chip, __be32 subcap_id, cap_t *cap,
 	int rc;
 
 	tpm_cmd.header.in = tpm_getcap_header;
-	if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {
-		tpm_cmd.params.getcap_in.cap = subcap_id;
+	if (subcap_id == TPM_CAP_VERSION_1_1 ||
+	    subcap_id == TPM_CAP_VERSION_1_2) {
+		tpm_cmd.params.getcap_in.cap = cpu_to_be32(subcap_id);
 		/*subcap field not necessary */
 		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
 		tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
 	} else {
 		if (subcap_id == TPM_CAP_FLAG_PERM ||
 		    subcap_id == TPM_CAP_FLAG_VOL)
-			tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
+			tpm_cmd.params.getcap_in.cap =
+				cpu_to_be32(TPM_CAP_FLAG);
 		else
-			tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
+			tpm_cmd.params.getcap_in.cap =
+				cpu_to_be32(TPM_CAP_PROP);
 		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
-		tpm_cmd.params.getcap_in.subcap = subcap_id;
+		tpm_cmd.params.getcap_in.subcap = cpu_to_be32(subcap_id);
 	}
 	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, 0,
 			      desc);
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index a76ab4a..59a1ead 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -193,7 +193,7 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
 		       be32_to_cpu(cap.manufacturer_id));
 
 	/* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */
-	rc = tpm_getcap(chip, CAP_VERSION_1_2, &cap,
+	rc = tpm_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
 			"attempting to determine the 1.2 version");
 	if (!rc) {
 		str += sprintf(str,
@@ -204,7 +204,7 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
 			       cap.tpm_version_1_2.revMinor);
 	} else {
 		/* Otherwise just use TPM_STRUCT_VER */
-		rc = tpm_getcap(chip, CAP_VERSION_1_1, &cap,
+		rc = tpm_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
 				"attempting to determine the 1.1 version");
 		if (rc)
 			return 0;
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 4d183c9..edc6f75 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -282,21 +282,20 @@ typedef union {
 } cap_t;
 
 enum tpm_capabilities {
-	TPM_CAP_FLAG = cpu_to_be32(4),
-	TPM_CAP_PROP = cpu_to_be32(5),
-	CAP_VERSION_1_1 = cpu_to_be32(0x06),
-	CAP_VERSION_1_2 = cpu_to_be32(0x1A)
+	TPM_CAP_FLAG = 4,
+	TPM_CAP_PROP = 5,
+	TPM_CAP_VERSION_1_1 = 0x06,
+	TPM_CAP_VERSION_1_2 = 0x1A,
 };
 
 enum tpm_sub_capabilities {
-	TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
-	TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
-	TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
-	TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
-	TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
-	TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
-	TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
-
+	TPM_CAP_PROP_PCR = 0x101,
+	TPM_CAP_PROP_MANUFACTURER = 0x103,
+	TPM_CAP_FLAG_PERM = 0x108,
+	TPM_CAP_FLAG_VOL = 0x109,
+	TPM_CAP_PROP_OWNER = 0x111,
+	TPM_CAP_PROP_TIS_TIMEOUT = 0x115,
+	TPM_CAP_PROP_TIS_DURATION = 0x120,
 };
 
 struct	tpm_getcap_params_in {
-- 
2.7.4


------------------------------------------------------------------------------

Re: [PATCH 2/2] tpm: fix bad constant expressions

[Winkler, Tomas]

> -----Original Message-----
> From: Jarkko Sakkinen [mailto:jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org]
> Sent: Monday, September 19, 2016 23:22
> To: Peter Huewe <peterhuewe-Mmb7MZpHnFY@public.gmane.org>
> Cc: moderated list:TPM DEVICE DRIVER <tpmdd-
> devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>; open list <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
> Subject: [tpmdd-devel] [PATCH 2/2] tpm: fix bad constant expressions
> 
> Sparse reports "bad constant expression" for the use of cpu_to_be32 inside
> enums tpm_capabilities and tpm_sub_capabilities. Even though it is probably
> expanded to a constant expression, it is probably cleaner not to use it there.


Swap macros were rewritten due to possible compiler bug https://lkml.org/lkml/2016/5/2/597
And the warning is actually a bug in sparse, it fails to detect constant expression now.


Tomas

> 
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
> ---
>  drivers/char/tpm/tpm-interface.c | 13 ++++++++-----
>  drivers/char/tpm/tpm-sysfs.c     |  4 ++--
>  drivers/char/tpm/tpm.h           | 23 +++++++++++------------
>  3 files changed, 21 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-
> interface.c
> index ca6162e..db7359f 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -444,19 +444,22 @@ ssize_t tpm_getcap(struct tpm_chip *chip, __be32
> subcap_id, cap_t *cap,
>  	int rc;
> 
>  	tpm_cmd.header.in = tpm_getcap_header;
> -	if (subcap_id == CAP_VERSION_1_1 || subcap_id ==
> CAP_VERSION_1_2) {
> -		tpm_cmd.params.getcap_in.cap = subcap_id;
> +	if (subcap_id == TPM_CAP_VERSION_1_1 ||
> +	    subcap_id == TPM_CAP_VERSION_1_2) {
> +		tpm_cmd.params.getcap_in.cap = cpu_to_be32(subcap_id);
>  		/*subcap field not necessary */
>  		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
>  		tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
>  	} else {
>  		if (subcap_id == TPM_CAP_FLAG_PERM ||
>  		    subcap_id == TPM_CAP_FLAG_VOL)
> -			tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
> +			tpm_cmd.params.getcap_in.cap =
> +				cpu_to_be32(TPM_CAP_FLAG);
>  		else
> -			tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
> +			tpm_cmd.params.getcap_in.cap =
> +				cpu_to_be32(TPM_CAP_PROP);
>  		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
> -		tpm_cmd.params.getcap_in.subcap = subcap_id;
> +		tpm_cmd.params.getcap_in.subcap =
> cpu_to_be32(subcap_id);
>  	}
>  	rc = tpm_transmit_cmd(chip, &tpm_cmd,
> TPM_INTERNAL_RESULT_SIZE, 0,
>  			      desc);
> diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
> index a76ab4a..59a1ead 100644
> --- a/drivers/char/tpm/tpm-sysfs.c
> +++ b/drivers/char/tpm/tpm-sysfs.c
> @@ -193,7 +193,7 @@ static ssize_t caps_show(struct device *dev, struct
> device_attribute *attr,
>  		       be32_to_cpu(cap.manufacturer_id));
> 
>  	/* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */
> -	rc = tpm_getcap(chip, CAP_VERSION_1_2, &cap,
> +	rc = tpm_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
>  			"attempting to determine the 1.2 version");
>  	if (!rc) {
>  		str += sprintf(str,
> @@ -204,7 +204,7 @@ static ssize_t caps_show(struct device *dev, struct
> device_attribute *attr,
>  			       cap.tpm_version_1_2.revMinor);
>  	} else {
>  		/* Otherwise just use TPM_STRUCT_VER */
> -		rc = tpm_getcap(chip, CAP_VERSION_1_1, &cap,
> +		rc = tpm_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
>  				"attempting to determine the 1.1 version");
>  		if (rc)
>  			return 0;
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index
> 4d183c9..edc6f75 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -282,21 +282,20 @@ typedef union {
>  } cap_t;
> 
>  enum tpm_capabilities {
> -	TPM_CAP_FLAG = cpu_to_be32(4),
> -	TPM_CAP_PROP = cpu_to_be32(5),
> -	CAP_VERSION_1_1 = cpu_to_be32(0x06),
> -	CAP_VERSION_1_2 = cpu_to_be32(0x1A)
> +	TPM_CAP_FLAG = 4,
> +	TPM_CAP_PROP = 5,
> +	TPM_CAP_VERSION_1_1 = 0x06,
> +	TPM_CAP_VERSION_1_2 = 0x1A,
>  };
> 
>  enum tpm_sub_capabilities {
> -	TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
> -	TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
> -	TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
> -	TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
> -	TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
> -	TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
> -	TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
> -
> +	TPM_CAP_PROP_PCR = 0x101,
> +	TPM_CAP_PROP_MANUFACTURER = 0x103,
> +	TPM_CAP_FLAG_PERM = 0x108,
> +	TPM_CAP_FLAG_VOL = 0x109,
> +	TPM_CAP_PROP_OWNER = 0x111,
> +	TPM_CAP_PROP_TIS_TIMEOUT = 0x115,
> +	TPM_CAP_PROP_TIS_DURATION = 0x120,
>  };
> 
>  struct	tpm_getcap_params_in {
> --
> 2.7.4
> 
> 
> ------------------------------------------------------------------------------
> _______________________________________________
> tpmdd-devel mailing list
> tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> https://lists.sourceforge.net/lists/listinfo/tpmdd-devel

------------------------------------------------------------------------------

Re: [tpmdd-devel] [PATCH 2/2] tpm: fix bad constant expressions

[Jarkko Sakkinen]

On Tue, Sep 20, 2016 at 07:08:40AM +0000, Winkler, Tomas wrote:
> 
> > -----Original Message-----
> > From: Jarkko Sakkinen [mailto:jarkko.sakkinen@linux.intel.com]
> > Sent: Monday, September 19, 2016 23:22
> > To: Peter Huewe <peterhuewe@gmx.de>
> > Cc: moderated list:TPM DEVICE DRIVER <tpmdd-
> > devel@lists.sourceforge.net>; open list <linux-kernel@vger.kernel.org>
> > Subject: [tpmdd-devel] [PATCH 2/2] tpm: fix bad constant expressions
> > 
> > Sparse reports "bad constant expression" for the use of cpu_to_be32 inside
> > enums tpm_capabilities and tpm_sub_capabilities. Even though it is probably
> > expanded to a constant expression, it is probably cleaner not to use it there.
> 
> 
> Swap macros were rewritten due to possible compiler bug https://lkml.org/lkml/2016/5/2/597
> And the warning is actually a bug in sparse, it fails to detect constant expression now.

I still think that these must be change in order to have some
consistency in the subsystem. Now there are two differing
conventions.

/Jarkko

RE: [tpmdd-devel] [PATCH 2/2] tpm: fix bad constant expressions

[Winkler, Tomas]

> On Tue, Sep 20, 2016 at 07:08:40AM +0000, Winkler, Tomas wrote:
> >
> > > -----Original Message-----
> > > From: Jarkko Sakkinen [mailto:jarkko.sakkinen@linux.intel.com]
> > > Sent: Monday, September 19, 2016 23:22
> > > To: Peter Huewe <peterhuewe@gmx.de>
> > > Cc: moderated list:TPM DEVICE DRIVER <tpmdd-
> > > devel@lists.sourceforge.net>; open list
> > > <linux-kernel@vger.kernel.org>
> > > Subject: [tpmdd-devel] [PATCH 2/2] tpm: fix bad constant expressions
> > >
> > > Sparse reports "bad constant expression" for the use of cpu_to_be32
> > > inside enums tpm_capabilities and tpm_sub_capabilities. Even though
> > > it is probably expanded to a constant expression, it is probably cleaner
> not to use it there.
> >
> >
> > Swap macros were rewritten due to possible compiler bug
> > https://lkml.org/lkml/2016/5/2/597
> > And the warning is actually a bug in sparse, it fails to detect constant
> expression now.
> 
> I still think that these must be change in order to have some consistency in
> the subsystem. Now there are two differing conventions.

Nothing against the convention just the commit message is misleading in that sense. 
Tomas

Re: [tpmdd-devel] [PATCH 2/2] tpm: fix bad constant expressions

[Jarkko Sakkinen]

On Tue, Sep 20, 2016 at 09:57:48AM +0000, Winkler, Tomas wrote:
> 
> > On Tue, Sep 20, 2016 at 07:08:40AM +0000, Winkler, Tomas wrote:
> > >
> > > > -----Original Message-----
> > > > From: Jarkko Sakkinen [mailto:jarkko.sakkinen@linux.intel.com]
> > > > Sent: Monday, September 19, 2016 23:22
> > > > To: Peter Huewe <peterhuewe@gmx.de>
> > > > Cc: moderated list:TPM DEVICE DRIVER <tpmdd-
> > > > devel@lists.sourceforge.net>; open list
> > > > <linux-kernel@vger.kernel.org>
> > > > Subject: [tpmdd-devel] [PATCH 2/2] tpm: fix bad constant expressions
> > > >
> > > > Sparse reports "bad constant expression" for the use of cpu_to_be32
> > > > inside enums tpm_capabilities and tpm_sub_capabilities. Even though
> > > > it is probably expanded to a constant expression, it is probably cleaner
> > not to use it there.
> > >
> > >
> > > Swap macros were rewritten due to possible compiler bug
> > > https://lkml.org/lkml/2016/5/2/597
> > > And the warning is actually a bug in sparse, it fails to detect constant
> > expression now.
> > 
> > I still think that these must be change in order to have some consistency in
> > the subsystem. Now there are two differing conventions.
> 
> Nothing against the convention just the commit message is misleading
> in that sense.  Tomas

Right. I can edit it to say that "sanitize the constant declarations" or
something like that.

/Jarkko